Signal processing device, signal processing method, and program for stabilizing localization of a sound image in a center direction

Abstract

The present technology relates to a signal processing device, a signal processing method, and a program capable of stabilizing localization of a sound image in a center direction.Input signals of audio of two channels are added to generate the addition signal. Moreover, convolution of the addition signal and a head related impulse response (HRIR) in a center direction is performed to generate a center convolution signal. Furthermore, convolution of the input signal and a binaural room impulse response (BRIR) is performed to generate an input convolution signal. Then, the center convolution signal and the input convolution signal are added to generate an output signal. The present technology can be applied, for example, in a case of reproducing listening conditions in various sound fields.

The invention claimed is: 
     
       1. A signal processing device comprising:
 processing circuitry configured to: 
 add input signals of audio of two channels to generate an addition signal; 
 correct the addition signal by performing convolution of the addition signal and a correction characteristic, so as to compensate for an amplitude characteristic of a head related impulse response (HRIR); 
 perform convolution of the corrected addition signal and the HRIR in a center direction to generate a center convolution signal; 
 perform convolution of each of the input signals and a binaural room impulse response (BRIR) to generate respective input convolution signals; and 
 add the center convolution signal and each of the input convolution signals to generate respective output signals. 
 
     
     
       2. The signal processing device according to  claim 1 , wherein the processing circuitry is further configured to delay the input signals to be subjected to the convolution with the BRIR. 
     
     
       3. The signal processing device according to  claim 1 , wherein the processing circuitry is further configured to apply a predetermined gain to the addition signal. 
     
     
       4. A signal processing device comprising:
 processing circuitry configured to: 
 add input signals of audio of two channels to generate an addition signal; 
 perform convolution of the addition signal and a head related impulse response (HRIR) in a center direction to generate a center convolution signal; 
 perform convolution of each of the input signals and a binaural room impulse response (BRIR) to generate respective input convolution signals; and 
 add the center convolution signal and each of the input convolution signals to generate respective output signals, wherein 
 a room impulse response (RIR) included in the BRIR is adjusted so that 
 more indirect sounds for which a L input signal of a left (L) channel out of the input signals is a sound source arrive from a left side than a case where only the input convolution signal is used as the output signal, and 
 more indirect sounds for which a R input signal of a right (R) channel out of the input signals is a sound source arrive from a right side than a case where only the input convolution signal is used as the output signal. 
 
     
     
       5. A signal processing method comprising:
 adding input signals of audio of two channels to generate an addition signal; 
 correcting the addition signal by performing convolution of the addition signal and a correction characteristic, so as to compensate for an amplitude characteristic of a head related impulse response (HRIR); 
 performing convolution of the corrected addition signal and the HRIR in a center direction to generate a center convolution signal; 
 performing convolution of each of the input signals and a binaural room impulse response (BRIR) to generate respective input convolution signals; and 
 adding the center convolution signal and each of the input convolution signals to generate respective output signals. 
 
     
     
       6. A non-transitory computer readable medium storing instructions that, when executed by processing circuitry, perform a signal processing method comprising:
 adding input signals of audio of two channels to generate an addition signal; 
 correcting the addition signal by performing convolution of the addition signal and a correction characteristic, so as to compensate for an amplitude characteristic of a head related impulse response (HRIR); 
 performing convolution of the corrected addition signal and the HRIR in a center direction to generate a center convolution signal; 
 performing convolution of each of the input signals and a binaural room impulse response (BRIR) to generate respective input convolution signals; and 
 adding the center convolution signal and each of the input convolution signals to generate respective output signals.